Aqueous zinc-ion batteries(AZIBs)manganese oxide cathode materials were prepared from electrolytic manganese anode mud(EMAM)by roasting activation method,and the effects of different roasting temperatures(300,425 and 575℃)on the structure,morphology and electrochemical properties of manganese oxide cathode materials under nitrogen atmosphere were investigated by XRD,TGA,SEM,and electrochemical performance tests.The results showed that the diffraction peak strength and crystallinity of manganese oxide cathode materials were improved by roasting under nitrogen atmosphere,and the materials exhibited morphology of flakes and particles,with the agglomeration phenomenon reduced and the voids increased.The structure of the manganese oxide cathode materials was gradually transformed from α-MnO2 to Mn2O3 and Mn3O4 along with the increase of the roasting temperature.Calcination improved the initial discharge specific capacity,rate performance and cycle performance of manganese oxide cathode material,with the material showing a smaller Warburg coefficient and a faster diffusion rate of Zn2+.The manganese oxide cathode material(300-EMAM)prepared at roasting temperature of 300℃showed better electrochemical performance,with an initial discharge specific capacity of 232 mA·h/g at 5 C,that of 190 mA·h/g maintained after 100 cycles,and the 300-EMAM electrode exhibiting a lower contact resistance(33.6 Ω)and charge transfer resistance(816.3 Ω).
关键词
水系锌离子电池/正极材料/二氧化锰/电解锰阳极泥/功能材料
Key words
aqueous zinc ion batteries/cathode materials/manganese dioxide/electrolytic manganese anode mud/functional materials
维普
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